Vanguard CT-3500 User Manual
Page 23
Model CT-3500
Operating Procedures
APPENDIX A
CT-3500
Troubleshooting Guide
Item
Symptom
Possible Problem
Solution
1
CT-3500 will not
start timing.
1. No trigger voltage
detected.
2. Broken trigger lead.
1.Check trigger cable connection
to Trip and Close coil.
2. Inspect trigger cable cables.
2
CT-3500 displays
“Detect Standing
Voltage”.
1.There is standing voltage
across trigger input lead.
The CT-3500 expects a
voltage only when the
circuit breaker coil is
energized.
1. Check trigger-cable
connection to trip and close coil.
2. If there is standing voltage
across coil, check for lamp
(indicator) circuit.
3
Timing channels is
not working
correctly.
1. Bad contact cable
connection to breaker.
2. Missing common
connection on the breaker
bushing.
1 Check contact cable
connection to breaker.
2. Inspect contact leads.
3. Make sure the common side
(black lead) of contact bushing is
tied to ground.